Ive tried all the latest spark plug fad over the years and Ive found with a stock to slightly mod. engine, the original brand and heat range works best. I think you said you had over 100,000 on your original plugs. I think that speaks for itself.

Don't get the Bosch +4 quad tip plugs! No matter how many times I torque them down, a few keep coming loose in my 2003 Silverado and it is a known issue with those plugs. Definitely not worth $8.50/plug. I wish I would have know about it before I got them. Oh well. Live and learn.